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Troubleshooting CoS Schedulers on a 40-port SFP+ Line Card in an EX8200 Switch

Problem

Description

After you configure a scheduler map on an interface on the 40-port SFP+ line card, you notice one or both of the following:

  • All packets are being dropped on a class-of-service queue configured on the interface.

  • A message in the system log states that the interface is using the default scheduler map, not the scheduler map you configured. For example:

Cause

The ports in a 40-port SFP+ line card are divided into eight groups, each group comprising five ports. The ports in a port group share 10 gigabits of bandwidth. Because the port groups share bandwidth, only one scheduler map can be active at a time in a port group. If you configure different scheduler maps for different interfaces in a port group, you do not receive an error when you commit the configuration. Instead, default scheduler map becomes the active scheduler map for all interfaces in the port group, and messages in the system log report that the default scheduler map is in use for the affected interfaces. If the default scheduler map does not define a queue, all traffic is dropped on that queue.

Solution

Check your CoS configuration for the interfaces in the port group. If you have different scheduler maps assigned to different interfaces in the port group:

  1. Delete the scheduler map configuration for all interfaces in the port group.

  2. Determine the scheduler map that you want all interfaces in the port group to use.

  3. Assign that scheduler map to at least one interface in the port group. The remaining interfaces in the port group will adopt this scheduler map.

    Best Practice:

    To prevent confusion and future configuration conflicts, explicitly assign the scheduler map to each interface in the port group.

  4. After you commit the configuration, verify that the scheduler map is the active scheduler map for the interfaces in the port group by using the show class-of-service forwarding-table scheduler-map command.

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